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70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <memory>
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#include "arrow/status.h"
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#include "arrow/util/macros.h"
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#include "arrow/util/visibility.h"
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namespace arrow {
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class Buffer;
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namespace json {
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struct ParseOptions;
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/// \class Chunker
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/// \brief A reusable block-based chunker for JSON data
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///
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/// The chunker takes a block of JSON data and finds a suitable place
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/// to cut it up without splitting an object.
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class ARROW_EXPORT Chunker {
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public:
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virtual ~Chunker() = default;
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/// \brief Carve up a chunk in a block of data to contain only whole objects
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/// \param[in] block json data to be chunked
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/// \param[out] whole subrange of block containing whole json objects
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/// \param[out] partial subrange of block a partial json object
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virtual Status Process(const std::shared_ptr<Buffer>& block,
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std::shared_ptr<Buffer>* whole,
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std::shared_ptr<Buffer>* partial) = 0;
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/// \brief Carve the completion of a partial object out of a block
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/// \param[in] partial incomplete json object
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/// \param[in] block json data
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/// \param[out] completion subrange of block containing the completion of partial
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/// \param[out] rest subrange of block containing what completion does not cover
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virtual Status ProcessWithPartial(const std::shared_ptr<Buffer>& partial,
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const std::shared_ptr<Buffer>& block,
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std::shared_ptr<Buffer>* completion,
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std::shared_ptr<Buffer>* rest) = 0;
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static std::unique_ptr<Chunker> Make(const ParseOptions& options);
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protected:
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Chunker() = default;
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ARROW_DISALLOW_COPY_AND_ASSIGN(Chunker);
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};
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} // namespace json
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} // namespace arrow
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